The data in the time series input file are scale factors used to multiply the calculated stresses from the results file. So, if you want the stress produced by 9800 mm/s^2 to be used in the fatigue calculations, you can either apply an acceleration value of 9800 in the FE model and define a scale factor of 1 in the time series input file or apply an acceleration value of 1 in the FE model and a scale factor of 9800 in the time series input file; or any other combination FE loading and time series scale factors that produces a net value of 9800.
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